I build SaaS products —
and help founders do the same.
Engineer with 6+ years shipping software. Now running diepen.io — a product studio that builds founders' ideas into SaaS — and Rezeptiona, AI voice agents that answer the phone for trades businesses.
What I'm building
Two products. One studio that builds for founders, one SaaS I run myself.
About
I'm Leander van Diepen. Product-minded engineer, six years in. I've shipped systems for Handelsblatt, built compliance tools inside SAP for the insurance sector, and stood up the OCR + LLM pipeline at helpcheck that took ~85% of manual data entry off humans.
These days I run diepen.io— a product studio that takes a founder's idea and ships it as a working SaaS — and Rezeptiona, my own SaaS putting AI voice agents on the phones of trades businesses.
I work in public, write about what I learn, and prefer shipping small things often over rebuilding the perfect thing twice.
Track record
Selected work
Handelsblatt Media Group
Core website infrastructure for Germany's leading business publication. Angular frontend and Koa backend serving millions of monthly visitors with enterprise-grade performance.
Impact:
Optimized platform performance and reduced infrastructure costs while scaling to handle increased traffic load
Tech Stack:
YouBookUs - Business Management Platform
Full-stack booking and business management system with real-time synchronization, multi-tenant architecture, and integrated payment processing for service-based businesses.
Impact:
Eliminated booking conflicts and streamlined operations, reducing manual work by 60% for service businesses
Tech Stack:
ClueZo - Enterprise Compliance Tool
SAP Cloud-based whistleblower platform enabling secure, multilingual compliance reporting for enterprise clients with integrated conversational AI and automated workflows.
Impact:
Streamlined compliance processes for insurance sector, reducing reporting time by 70% and ensuring regulatory adherence
Tech Stack:
Get in touch
Have a SaaS idea you want built? Send it to diepen.io. Want to talk engineering, AI agents, or just say hi? Email works.
Founder's SaaS Build Guide
Short notes on what I learn building diepen.io and Rezeptiona — shipped to your inbox when I have something worth sending.
Leander van Diepen
Engineer · Founder, diepen.io